Atmospheric conditions are well-governed by humidity. Which one among the following may best define humidity?

The Earth's atmosphere is mainly heated by which one of the following?

Which among the following layers of Earth's atmosphere contains the Ozone layer?

Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?

Which one of the following is the major cause of stratospheric ozone layer degradation?

Which one of the following gases is minimum by volume percentage in the Earth's atmosphere?